Answer:
when a substance is heated it gains thermal energy. Therefore its particles move faster and its temperature rises. when a substance is cool it loses thermal energy which causes its particles to move more slowly and its temperature to drop
A substance gains thermal energy when it is heated. As a result, its temperature increases, and its particle motion accelerates.
What is thermal energy?Thermal energy is the heat energy that is given to a substance when its temperature is increased.
As we know, all matter are made up of atoms, and atoms are made up of charged particles. These particles become random or come in motion when they get thermal energy or heat.
When substances get thermal energy or heat energy. They become active, and the particles move apart from each other.
So, due to thermal energy, the atoms become loose, and the substance loses its shape, the temperature decrease the atoms come closer to each other.
Thus, when a substance cools, thermal energy is lost, which slows down the movement of its particles and lowers the substance's temperature and vice versa.
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2. Which substance has the greatest molecular
mass?
(1) H2O2
(3) CF4
(2) NO
(4) I2
Answer:
The answer is choice (4)
Explanation:
Laker in 5 !!!
The substance with the greatest molecular mass is I₂.
The molecular mass is the sum of the atomic masses of all atoms in a molecule
Let's calculate the molecular mass of each compound to know the greatest.
molecular mass of H₂O₂ = 2 + 32 = 34 g/mol
molecular mass of CF₄ = 12 + (19 × 4) = 12 + 76 = 88 g/mol
molecular mass of NO = 14 + 16 = 30 g / mol
molecular mass of I₂ = 127 × 2 = 254 g/mol
Therefore, the substance with the greatest molecular mass is I₂.
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What are some properties of an ice cube that tell you it is a solid? Write at least one property, and explain
how it relates to an ice cube.
Answer:
Well ice cubes are normally liquids but it is frozen water making it a solid. Since they are made of water particles, they wouldn't normally be a solid, but the particles are packed close enough together to make it one. Hope this helps! :D
Explanation:
How could you classify these chemicals in one group: iron, gold, and tin?
O A. Magnets
O B. Metals
O C. Solutions
O D. Solids
Answer:
Metals
Explanation:
All these are metals
Answer:
B: It is metals.
Explanation:
Look at your periodic table to locate iron, gold, and tin.
Iron is Fe
Gold is Au
Tin is Sn
They are all located in the transition metals area.
So the chemicals are metals.
Hope it helped!
In a controlled experiment, the single factor manipulated by the researcher is
the dependent variable and the responding factor that is measured is the
independent variable.
true or false
Answer:
False
Explanation:
It is the opposite. A good way to remember is the that the dependent variable depends on the independent variable.
Complete the table by checking the correct column(s) for each description.
Description
Isotonic
Solution
Hypotonic
Solution
Hypertonic
Solution
7. A solution that has the same osmotic
concentration as a cell's cytoplasm
8. A solution that causes a cell to shrivel
9. A solution that causes a cell to swell
10. A solution that neither shrinks nor swells a cell
11. A solution in which there is more water outside
the cell than inside the cell
12. A solution that causes water to move out of a cell
Answer:
7. isotonic
8. hypertonic
9. hypotonic
10. isotonic
11. hypotonic
12. hypertonic
a) Compare the masses of the three cylinders. (1 point)
b) Compare the volumes of the three cylinders. (1 point)
Answer:
the answer would be ;B compare the volumes of the three cylinders
LAST QUESTION! THANKS SO MUCH FOR EVERYTHING!! :)
Answer:
D. Condensation
Explanation:
Which of the following is the mass in grams of 1 mole of a substance?
Answer:
he molar mass is defined as the mass in grams of 1 mol of that substance. One mole of isotopically pure carbon-12 has a mass of 12 g
Explanation:
A gas has 1.2 L of volume, 1.8 atm of pressure and 264 K temperature. If both the
volume was doubled but the pressure was halved, what would the new
temperature be?
Your answer
Temperature does not change, remains 264 K
Further explanationGiven
V₁= 1.2 L
P₁ = 1.8 atm
T₁ = 264
Required
The new temperature
Solution
The volume was doubled = 2V₁ = 2 x 1.2 = 2.4 L(V2)
The pressure was halved = 0.5P₁ = 0.5 x 1.8 = 0.9 atm(P2)
Combined gas law :
P₁V₁/T₁=P₂V₂/T₂
Input the value :
[tex]\tt \dfrac{1.8\times 1.2}{264}=\dfrac{0.9\times 2.4}{T_2}\\\\T_2=264[/tex]
Balance the following Equation Show your work.
1.____CaO + ____H2O → ____Ca(OH)2
2. ___HgO → ___Hg + ____O2
3. ___KI + ___Pb(NO3)2 → ____PbI2 + ___KNO3
4. ___Al + ___Cl2 → ___AlCl3
5. ___KBr + ___Cl2 → ___KCl + ____Br2
6. __Mg3(PO4)2 + __NaOH → __Na3PO4 + __Mg(OH)2
7. ___H2O → ___H2 + ___O2
8. ___CH4 + __O2 → __CO2 + __H2O
9. ___C2H6 + ___O2 → ___CO2 + ___H2O
10. ___H2 + ___N2 → ___NH3
Answer:
1) alr balanced
2) 2 2 1
3) 2 1 1 2
4) 2 3 2
5) 2 1 2 1
6) 1 6 2 3
7) 2 2 1
8) 1 2 1 2
9) 2 5 4 6
10) 3 1 2
Ilsa showed her parents a trick she learned in science class. She used water to make ice cubes. Ilsa then placed some ice cubes in a glass containing a clear liquid. The ice cubes floated. She then placed some ice cubes in another glass that also contained a clear liquid. In this glass, the ice cubes sank to the bottom of the glass. Ilsa did not tell her parents that the first glass contained water while the second glass contained rubbing alcohol. What can you conclude from this information?
A.
The ice cubes changed their density.
B.
Water has the same density as alcohol.
C.
Water has a greater density than alcohol.
D.
Alcohol has a greater density than the ice cubes.
Answer:
C. Water has a greater density than alcohol.
Explanation:
From the experiment, it can be shown that water has a greater density than the alcohol.
The ice cube is able to float in the water because, the density of the ice is less than the density of the water.
Density of ice < Density of water
So, the ice cube sinks in alcohol because the density of the ice cube is greater than the density of the alcohol.
Density of ice > Density of alcohol
Therefore, we can assume that since the density of ice is greater than density of alcohol, then the density of water is greater than that of the alcohol.
Draw the Lewis structure for the compound beryllium nitride, with chemical formula Be3N2
Answer:online research
Explanation:
2Na + 2H2O → 2NaOH + H2
How many grams of NaOH could you make with 8.0465 g of Na?
? g NaOH (use 5 sig fig
According to the stoichiometry of the given chemical equation, 13.9939 grams of NaOH would be made with 8.0465 g of Na.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample. It is useful in balancing chemical equations and making solutions of different concentrations.As according to the given chemical equation 46 g sodium gives 80 g sodium hydroxide, thus, 8.0465 g of sodium will give 8.0465×80/46=13.9939 grams.
Thus, 13.9939 grams of NaOH would be made with 8.0465 g of Na.
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pls helppp
How many energy must be absorbed by 150.0 grams of water to raise it's temperature by 50.00°C?
The heat absorbed to raise temperature : Q = 31350 J
Further explanationGiven
m = mass = 150 g
Δt = Temperature difference : 50 °C
Required
Heat absorbed
Solution
Heat can be formulated
Q = m.c.Δt
The specific heat of water = c = 4.18 J/g °C
Input the value :
Q = 150 x 4.18 x 50
Q = 31350 J
Balance the following chemical equation by providing the correct coefficients.
I’ll put a pic.
Please help!!!!!!!
Answer:
[2]HBr + [ ] Ba(OH)2 ➖ [ ] BaBr2 + [2] H20
Hope it will help :)
n the electron-dot symbol
the dots represent electrons located in —
s, p, and d sublevels.
p sublevels, only.
s sublevels, only.
s and p sublevels, only.
Answer:
They represent the valence electrons, so s and p sublevels only! This does not include the d block!
Write the full electron configuration of calcium.
152 2s22p6 352 4s2
Use the electron configuration to predict the most likely oxidation state of calcium?
(Explain your answer please)
Answer: [tex]1s^22s^22p^63s^23p^64s^2[/tex] , oxidation state = +2
Explanation:
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom. The electrons are filled according to Afbau's rule in order of increasing energies.
The electronic configuartion of Calcium with atomic number 20 is :
[tex]Ca:20:1s^22s^22p^63s^23p^64s^2[/tex]
As calcium can easily lose its two valence electrons to attain stability , its oxidation state is +2.
[tex]Ca^{2+}:18:1s^22s^22p^63s^23p^6[/tex]
Why does the sun seem to change position in the sky?
The first major contributor to the Sun's apparent motion is the fact that Earth orbits the Sun while tilted on its axis. The Earth's axial tilt of approximately 23.5° ensures that observers at different locations will see the Sun reach higher-or-lower positions above the horizon throughout the year.
hope this helps ^^
Answer:
Because the earth rotation, when we move around the sun for a whole 365 times then we will have passed 1 year.
Plz plz plz plz answer I have not much time
Fourth option is a neutral boron atom.
What is the reaction of Fe + AgC2H9O2?
Answer:
To balance a chemical equation, enter an equation of a chemical reaction and press the Balance button. The balanced equation will appear above. Use uppercase for the first character in the element and lowercase for the second character. Examples: Fe, Au, Co, Br, C, O, N, F. Ionic charges are not yet supported and will be ignored.
Explanation:
If a pea plant has a tall stem, what possible combinations of alleles could it have?
Answer:
controls stem height in peas, for example, has one allele for tall stems and one allele for short stems. Each pea plant inherits a combination of two alleles from its parents either two alleles for tall stems, two alleles for short stems, or one of each. Individual alleles control the inheritance of traits
Explanation:
A mixture of tea,
lemon juice, and
sugar is an example
of what?
Answer:
Explanation:
That in the liquid, the sugar is completely dissolved. Lemon juice, water, and sugar are combined together and form a solution. A solution is a mixture in which the various types of matter are evenly spread out. Water is considered the solvent of lemonade.
If you used 10 grams of aluminum, how many moles of aluminum chloride can be produced?
Answer:
When 20.0 grams of aluminum and 30.0 grams of chlorine are reacted according to the above equation, the chlorine is the limiting reactant and the maximum yield of aluminum chloride is 0.28 moles or 37.33 grams.
The diagram below shows a food web in a woodland.
If a certain organism is a secondary consumer, what best explains its position in the food web?
A X, because organism X feeds on producers
B Y, because organism Y feeds on producers
C X, because organism X feeds on a carnivore
D Y, because organism Y feeds on a herbivore
Answer:
Y because organism y feed on herbivores
Explanation:it means y is carnivores or omnivores
Explanation:
HELPP ME PLEASE PLEASE PLEASE IM BEGGING YOU!
Forty percent of atoms of an element have a mass of 16 AMU. sixty percent of atoms have a mass of 18 AMU. What is the average atomic mass, in AMU, of this element?
Answer:
(16)(.40)+18(.60)= Then the average atomic mass in amu is 17.2Describe the difference between the normal and
mutated hemoglobin amino acid sequences:
Answer:
The chain of colored boxes represent the first eight amino acids in the beta chain of hemoglobin. The sixth position in the normal beta chain has glutamic acid, while sickle beta chain has valine. This is the sole difference between the two
Explanation:
6. Which type of force(s) will cause a change in an object's motion? *
A) Balanced Forces
O B) Unbalanced Forces
Unbalanced forces cause a change in motion, speed, and/or direction. When two forces act in the same direction on an object, the net force is equal to the sum of the two forces.
Answer:
B.Unbalanced .............
PLEASE HELP ASAP I CANT FAIL THIS I NEED HELP. The
is the control center of the nervous system. It sends and receives signals to and from the entire body.
OA. spine
OB heart
OC. brain
OD. stomach
Answer:
brain
Explanation:
The central nervous system (CNS) controls most functions of the body and mind. It consists of two parts: the brain and the spinal cord. The brain is the center of our thoughts, the interpreter of our external environment, and the origin of control over body movement.
Answer:
OC brain, due to the brain being basically the smarts of your body, combined with it also managing, important functions of the body
Explanation:
Convert this temperature from F to C
26.6°c
93.600
62.2°C
5.7°C
1.Which form of energy is due to the motion of an object's particles .
A. thermal energy, B.chemical energy C.mechanical energy D.electromagnetic energy
Answer:
thermal
Explanation:
Thermal energy is due to the motion of an object's particles, due to the random movement of molecules in a system, thermal energy also known as random or internal kinetic energy is produced, hence option A is correct.
Atoms or molecules in motion are the source of thermal energy. An object's thermal energy rises as its temperature rises because the movement of its molecules or atoms accelerates. It is possible to transmit an object's thermal energy to another.
Thermal energy, also known as random or internal kinetic energy, is created when molecules in a system move randomly, as a result of the motion of an object's particles.
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